SMS

Send SMS messages with Vonage

Part of the Vonage Mcp Server Api Bindings MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

@vonage/vonage-mcp-server-api-bindings Write Risk 2/5

// WHEN AI AGENTS USE THIS TOOL

AI agents use SMS to create or modify resources in Vonage Mcp Server Api Bindings. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

// WHY ENFORCE A POLICY ON SMS

Without a policy, an AI agent could call SMS repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Vonage Mcp Server Api Bindings.

// RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

vonage-mcp-server-api-bindings.yaml

tools:
  SMS:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Vonage Mcp Server Api Bindings policy for all 13 tools.

// DETAILS

Tool Name SMS

Category Write

MCP Server Vonage Mcp Server Api Bindings MCP Server

Risk Level Medium

// MORE VONAGE MCP SERVER API BINDINGS TOOLS

Write create-application Write link-number-to-vonage-application Write outbound-voice-message Write rcs-send-text Write rcs-send-text-with-sms-failover Write whatsapp-send-text Write whatsapp-send-text-with-sms-failover Read balance

View all 13 tools →

// WHAT CAN GO WRONG

Agents calling write-class tools like SMS have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update AbraFlexi invoice_received_create

// RELATED READING

// FAQ

What does the SMS tool do? +

Send SMS messages with Vonage. It is categorised as a Write tool in the Vonage Mcp Server Api Bindings MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on SMS? +

Add a rule in your Intercept YAML policy under the tools section for SMS. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Vonage Mcp Server Api Bindings MCP server.

What risk level is SMS? +

SMS is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit SMS? +

Yes. Add a rate_limit block to the SMS rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block SMS completely? +

Set action: deny in the Intercept policy for SMS. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides SMS? +

SMS is provided by the Vonage Mcp Server Api Bindings MCP server (@vonage/vonage-mcp-server-api-bindings). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

SMS

Enforce policies on Vonage Mcp Server Api Bindings